Sawing-machine.



No. 883,922. PATENTED; APR. 7, 1908.

F. N. TREVOR. SAWING MACHINE.

APPLIUATION FILED JUNE 10. 1905.

TERS LI-WASHINGTON, D. c.

UNITED STATES PATENT OFFICE.

FRANCIS N. TREVOR, OF LOOKPORT, NEW YORK, ASSIGNOR TO TREVOR MANUFACTURING COMPANY, OF LOOKPORT, NEW YORK.

SAWIN GMACHINE Specification of Letters Patent.

Patented April 7, 1908.

Application filed June 10, 1905. Serial No. 264,671.

To all whom it may concern:

Be it known that I, FRANCIS N. TREVOR, a citizen of the United States, residing at Lockport, in the county of Niagara and State of New York, have invented a new and useful Improvement in Sawing-Machines, of which the following is a specification.

This invention relates to improvements in wood sawing machines of that class having a pendulous bolt carriage 1n which the bolt or block to be sawed is suspended and swung toward and from the vertically arranged circular saw, and a stationary bolt gage located at one side of the bolt carriage against which the bolt is pressed by the operator, before each forward or operative movement of the carriage, to correctly gage the thickness of the piece to be cut. This gage usually has two curved guides against which the bolt bears and slides in the forward movement of the bolt carriage. These machines are intended to saw bolts or blocks of different lengths and to secure the most efficient action of the machine the carriage should be adjusted vertically or the elevation of the bolt in the carriage so regulated that the saw will first enter the bolt near its upper end regardless of the length of the bolt. It has been found in the use of these machines that in order to prevent the bolt from tilting or assuming an inclined position when pressing it against the gage, it is necessary for the gage to be so situated as regards the bolt in the carriage, that one guide will be substantially the same distance above the vertical center of the bolt that the other guide is below such center. By this means, a firm and steady bearing surface is presented to the block, the resisting force of the guides being equally distributed both above and below the center of the block so that any tendency toward the tipping or inclination of the block is prevented.

The object of this invention is to provide an adjusting means for the bolt gage and its guides which will be simple in construction and easy of o )eration and will en able the operator to readily adjust the gage and guides to any size of block which may be used. This is done by making the entire gage adjustable vertically so that the center of the gage can be located substantially opposite the center of the block to be sawed and by providing means for the independent vertical adjustment of the curved guides against which the block or bolt bears in order to secure these guides in a position where they will be at corresponding distances above and below the center of the block or bolt.

Where the blocks to be sawed are very long, it is not necessary that the guides should be so situated as to engage the end portion of the block butthe ends may roject above andv below the guides, provided the guides are at corresponding distances above and below the center of the block. .In such cases, however, the guides should be placed at some distance from the center to prevent the tipping of the block.

In the accompanying draw ngs: Figure 1 is a side elevation of a sawing machine having a bolt gage embodying the invention. Fig. 2 is a perspective view of the gage removed from its supports. Fig. 3 is a vertical sectional view of the same. Fig. 4 is a top plan view thereof.

Like letters of reference refer to like parts in the several figures.

A represents the stationary main frame of the sawing machine, B the upright circular saw, and O the pendulous bolt carriage pivot ally supported by the arm aof the main frame. The lower portion of the carriage O has an open frame in which the bolt or block to be sawed, D is placed. A holding lever E is pivoted to the-carriage and has a handle e which the operator grasps for holding the bolt in position in the carriage and swinging the latter toward and from the saw.

F represents the standard for the bolt gage. This standard is secured to the main frame A in any suitable manner. In the upper portion of this standard is a vertical slotf.

The bolt gage consists of an upright supporting plate G having a central horizontally elongated opening 9. Located in this opening is a horizontally slotted block or bar H which is pivoted at its ends on two horizontal pivots or posts h adjustably mounted on the supportin plate at opposite sides of its opening g. T16 bar H is connected with the standard F by a bolt h which passes through the horizontal slot of the bar and the slot f in the standard. By this means the supporting plate H of the gage can be raised and lowered to the'eXtent necessary to place its center substantially opposite to the mid-height of the bolt in the pendulous carriage; it can be adjusted toward and from the edge of the saw so that the bolt will properly bear against the gage when it is in the forward position and clear 01 the saw and so that the gage can be advanced toward the saw from time to justed up and down on the main plate as desired. To these carrier plates are secured the curved guides K by horizontal adjusting screws k, by which screws the curved guides can be adjusted laterally toward and from the lane of the saw to regulate the thickness of t e slab or pieces which are cut from the bolt.

As the carrier plates I on which the curved guides are mounted are independently adjustable vertically on the supporting plate G, they can be set at the same distance above and below the center of the supporting plate after the latter has been adjusted to the proper height on the standard to place its center opposite to the vertical center of the bolt in the carriage. Thus the curved guides can be located at equal distances from the vertical center of the bolt regardless of the length of the latter and of the elevation of the carriage supporting the bolt.

In use, a block of the particular size to be sawed is placed in the sawing frame, the gage is adjusted vertically on its standard so that its centerwill be substantially opposite to the vertical center of the block. This is done by moving the bolt in the upright slot in the standard until the gage is in the desired position. The curved guides are then adjusted so that they will engage the side of the block at equal distances above and below its center.

The guides are then further adjusted horizontally toward or from the plane of the saw by the screws lc to regulate the width of the piece to be cut.

The operation of the machine after the gage is adjusted is the same as other machines of this well known type, and need not be herein explained.

claim as my invention:

1. The combination of a frame, a circular saw, a pendulous bolt carriage, a bolt gage secured to said frame and having guides against which the bolt bears, said gage with said guides being adjustable vertically as a unit on the frame, and said guides being independently adjustable vertically on said gage, substantially as set forth.

2. The combination of a frame, a circular saw, a pendulous bolt carriage, a bolt gage secured to said frame and comprising a supporting plate adjustable vertically on said frame, and guides separately secured to said supporting plate and capable of separate adjustment vertically thereon toward and from each other independently of the adjustments of the gage plate, substantially as set forth.

3. The combination of a frame, a circular saw, a pendulous bolt carriage, a bolt gage consisting of a supporting plate secured to said frame, carrier plates secured to said supporting plate and capable of vertical movement thereon independently of the adjustment of the supporting plate, and guides carried by said carrier plates and adjustable laterally thereon toward and from the plane of the saw, substantially as set forth.

4. The combination of a frame, a circular saw, a pendulous bolt carriage, a bolt gage consisting of a supporting plate adjustably secured to'said frame and having vertical slots in its upper and lower portions, carrier plates, bolts in said slots for adjustably securing said carrier plates on said supporting plate, and curved guides carried by said carrier plates and adjustable laterally thereon toward and from the plane of the saw, substantially as set forth.

Witness my hand this 5 day of June, 1905.

FRANCIS N. TREVOR.

Witnesses:

MINNA L. WEBSTER, H. FROST OUsHMAN. 

